Pump



May 8, 1928.

N. 1'. BRADFORD PUMP Filed Feb. 8. 1927 FIGURE 5 mvENToR Manuf-:Y

Patented May 8, 1928.

UNITED ASTATES N 1,668,108 PATENT OFFICE.

NATHAN T. BRADFORD, oF TERRA BELLA, CALIFORNIA PUMP.

Applicationfniea February s, `1927. serial No. 166,'739.

providea simple and etlicient means for lubricating the various moving parts of the pump in the pump bowls and adjacent lather-ete. i l

Finally it is an objectief the invention to provide a structure of the character indicated thattwill be economical to manufacture, quickly andeasilyassembled and dis? assembled.' and highly `,efficient in its prat tical application.

VIn the drawing:

Figure 1 is a vertical transverse sectionv through a` pump embodyingmy invention. f

Figure 2 isa section online 2-2 of Fim ure ,Referring now more particularly to the drawing, I show the stationary parts of the pump structure comprising the following elements. Inthe present disclosure I show two bowls as 1 and 2 threaded together atl 3, the `bowl 1 carrying a suction pipe or sec# tion 4, and the bowll 2 being screwed on to a discharge casing section as 5.

The bowl. 1 isprovided with a concentrically arranged bearing 6 and an annular-recess to receive an'impeller neck as at 7.

The suction pipe 4 Supports a step bearing 8 by means of webs 9, the bearing being pro vided with a bearing surface 10 in alignment with the bearing surface 6 of the bowl 1. and extending a distance above the upper member y 26 having a conduit 27 lengthwise therethrough. On to the lower Figure Sis a section on line 3 3 of Figl edge` of the step bearing 8 as shown at 11.`

The upper end of the 5 threaded as at 19to receive the lower end of a tubular member having an upper end of smaller diameter as shownat 21.

This tube is provided with a bearing 22.1the samebeing a continuation of the bearing 16 and in alignment therewith. The upper end of the member 20 is connected to a t-ube section 23 byfmeans of a coupling member 2a,` the column, of which section 23 is the lower end,y eneloses the rotating shaft and provides a conduit for lubricating oil.

The rotating parts of thisjportion of the pump comprise a tube 25 mounted to rotate in tube 23 and threaded on to a coupling passing end of the coupling is threaded a tubular section 28, this section being so proportioned that it will rotate smoothly on the tube 13 and inthe bearing 16, extending downwardly to a` point` below thebearing 16 and hav-` ing threaded engagement with the upper impeller 29. Y

IAnother tubular section is shown at revolubl mounted ontube 13 and in bearing 6 o bowl lhaving threaded en age.-

ment with i1npeller29 at its upper en and with impeller `31 at its lower end as shown.

Still another tubular section is shown at 32 having threaded engagement with im- -peller 31 at its upper end, its lower end extending downwardly into the step bearing and rotating on the tube 13 and inbearing 10; The impellers29` and 31 are provided `with annular recesses as at and' 341 to receive the upper ends of the lbearings 1() and 6 as shown. ADrainage conduits are shown at and 36, one extending from bearing 16 to the exterior of bowl 2, and the other draining from bearing 6 into the well,

Then the pump is in operation, oil from a source not shown is fed down between the structure 25, 26, 28 and the enclosing members 23, 21, 22 and 16 where it eventually passes out through conduit 35 into `the well. Lubricating oil is also fed down through the inside of tube 25, through conduit 27, tube 28 and between the central bearing tube 13 and the several sections 30, 32 `and into the step bearing 8 where it passes upwardly around the bottom section 32 and finally drains off into the well at 36. By means of lthis construction the whole rotating structure is maintained in its true axial alignment, and it is correctly lubricated with a suitable oil at both ends of the pump bowl structure, the intermediate bearings being water lubricated, as to the exterior of bowl having a'sliaft bearing formed therein,

a step bearing suspended below the same, an impeller mounted in said bowl, a tubular shaft revolubly mounted in said bearings and carrying 'said impeller, a fixed bearing clement `axially mounted inthe bottom of said step bearing whereby to form an inner bearing for said shaft, means for introducing a lubricating iuid between the tubular shaftand bearing element, and a drain from the interior of the step bearing to the exterior thereof at a point above the lower end of the revoluble shaft.

2. A pump structure comprising a plurality of bowls mounted in operative relation to each othena bearing concentrically formed in each bowl, and a step bearing suspended below the lowermost bowl, a bearing element mounted in said step bearing in spaced relation thereto and extending axiallv through said bowls, a tube mounted upon the uppermost bowl in concentric relation thereto. atubular shaft revolubly mounted in said last mentioned tube and having a coupling mounted on its lower end provided with a conduit extending therethrough and communicating with the tubular shaft, and tubular shaft sections suspended from said coupling and rex'olvingir therewith and rrevolubly engaging the exterior of said bearing element and the bearings of said bowls, a.

drain from the upper bowl bearing, and impellers mounted on said tubular shaft within said bowls.

3. A 'pump structure comprising a pump bowl having a shaft bearing formed therein, an impeller mounted therein and a step bearing provided with a bearing surface in alignment with the bearing surface of the bowl supported thereby, a fixed bearing element mounted in the. step bearing and vextending axially through the howl, and a tubular shaft mounted in the impeller and engaging the bearing surface of the step bearing and the bearing element, and the bearing surface of the bowl. i

et. A pump structure including a pump howl, an impeller mounted therein, a step bearing provided with a bearing surface concentricallyarranged relative to the of the bowl supported thereby, a fixed central bearing element mounted in the step bearing and a tubular shaft mounted on the impeller and revolubly mounted between the step bearing and central bearing element.

5. A pump structure comprising a pluralitv of bowls mounted in operative relation to each other, a bearing concentrically formed in each bowl, and a step bearing suspended below the lowermost bowl, a bearing element mounted in said step bearing in spaced relation thereto and extending axial- 1y through said bowls, means for introducing lubricatingfluid into the `bearing of the uppermost bowl and drainage means therefrom, tubular shaft sections revolubly mounted in the bearings of said bowls and revolubly engaging the exterior of said bearing element, one shaft section extending between the step bearingr and the bearing element, in'lpellers mounted on said shaft i sectlons within said bowls, means for-intro- Y ducing a lubricating fluid between said shaft sections and the bearing element and step bearing, and a drain from the step bearing.

NATHAN T. BRADFORD.

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